Pg Adjustment - Epson L800 Service Manual

L800/L801

2.2.6 PG Adjustment

Described below is the platen gap (PG) adjustment.
¸ Purpose:
Adjust the distance between the head surface and the Paper Guide Front Assy
(platen) properly and adjust the parallelism on the 0th column side and on the 80th
columns side to ensure reliable print quality.
Once the Carriage Assy and/or Adjustment Bushes have been removed or
whenever necessary for any other reason, make this adjustment to correct the
deviation of the platen gap.
PG Size
Position
(mm)
PG- EPSON special thick paper
1.2
<APG Home> PGPP, Postcards, Matte, etc.
Plain paper
PG typ.
<Mechanical 1.7 EPSON special thin paper, SF, etc.
default>
Rubbing with PG1.2 is avoided
Envelopes
PG+ 2.35
Rubbing with PG1.2 and 1.7 is avoided
PG++ 4.2 CD-R printing
¸ Things to be used
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Thickness gauge:
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Phillips screwdriver
Adjustment
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Table 2-5. PG Positions
Application for Printing
(selected from PG flag list for
normal/head rubbing)
Cleaning
CR measurement,
VH detection
CR home position
seek
At ink replacement
1.15 mm (x2)
1.3 mm (x2)
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C A U T I O N
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C H E C K
P O I N T
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Sequence
Application
Using the Adjustment Program
The thickness gauge to be used must be free from dust and dirt
and from deformation. Be sure to clean it before use.
Take care that the Print Head is not soiled or scratched.
To ensure high accuracy of adjustment, install the Adapters in
the carriage, and move the carriage right and left by pulling the
belt without holding the carriage.
Make this adjustment after installing the Printer Mechanism
and CISS section. (Install the Linear Scale after adjustment.)
Refer to "1.2.2 Disassembly Flowchart"
With L800/L801, four stages of PG setting are available by
means of the APG Mechanism. However, make this adjustment
with the mechanism in the minimum PG position (PG-: 1.2
mm). (Refer to "1.5.4 APG Unit" (p.41)
Locating hole
Locating hole
Figure 2-8. PG Position at PG Adjustment
Revision A
(p.18).
and below.)
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